In KDE 5.4.2 in Kubuntu 15.10, we found that three options
(Actions, Compress, Extract) disappeared from context menu in
Dolphin. But actually these three options are there, are still usable. Probably
this is just a little error and we now can show them again
by this command:

This command will give /usr/share/kservicetype5 directory a file
named konqpopupmenuplugin.desktop (as a symbolic link) from
/usr/share/kde4/servicetypes/ directory. By having this file, Dolphin
will automatically recognize its own plugins for right-click context
menu such as Compress Here, Extract Here, and much more. You don't
need to restart to see the changes. See pictures below.

Before

After

What you get by doing this simple workaround is what you can see in
Dolphin Services List (menu Tools > Configure Dolphin >
Services). Now, you have some additional plugins activated such as
Compress:, Extract:, Send As Email:, and some
more. We say thanks to Markus Straub for his comment about
this fix in https://bugs.launchpad.net/ubuntu/+source/dolphin/+bug/1499530/comments/4.